On 11/20/2017 12:46 PM, Andy Lutomirski wrote:>>> + /*>>> + * We could theoretically do this in setup_fixmap_gdt().>>> + * But, we would need to rewrite the above page table>>> + * allocation code to use the bootmem allocator. The>>> + * buddy allocator is not available at the time that we>>> + * call setup_fixmap_gdt() for CPU 0.>>> + */>>> + kaiser_add_user_map_early(get_cpu_gdt_ro(0), PAGE_SIZE,>>> + __PAGE_KERNEL_RO | _PAGE_GLOBAL);>> This one is needs to stay.> When you rebase on to my latest version, this should change to mapping> the entire cpu_entry_area.

I did this, but unfortunately it ends up having to individually map allfour pieces of cpu_entry_area. They all need different permissions andwhile theoretically we could do TSS+exception-stacks in the same call,they're not next to each other: